Gilbert damping in the layered antiferromagnet CrCl3 |
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Authors: | Xinlin Mi Ledong Wang Qi Zhang Yitong Sun Yufeng Tian Shishen Yan Lihui Bai |
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Affiliation: | School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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Abstract: | We theoretically and experimentally studied the Gilbert damping evolution of both acoustic and optical magnetic resonance modes in the layered flake CrCl3 with an external magnetic field H applied in plane. Based on a Lagrangian equation and a Rayleigh dissipation function, we predicted that the resonance linewidth ΔH as a function of microwave frequency ω is nonlinear for both acoustic and optical modes in the CrCl3 flake, which is significantly different from the linear relationship of ΔH ∝ ω in ferromagnets. Measuring the microwave transmission through the CrCl3 flake, we obtained the ω-H dispersion and damping evolution ΔH-ω for both acoustic and optical modes. Combining both our theoretical prediction and experimental observations, we concluded that the nonlinear damping evolution ΔH-ω is a consequence of the interlayer interaction during the antiferromagnetic resonance, and the interlayer Gilbert dissipation plays an important role in the nonlinear damping evolution because of the asymmetry of the non-collinear magnetizaiton between layers. |
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Keywords: | Gilbert damping antiferromagnetic resonance (AFMR) CrCl3 |
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